largest tire on 14" rally wheels

The minimum recommended wheel size for a 245/60/R14 is 7". So we are talking an extra .5" per side.

I run an 11.25" rim with a 12.50 tire. That's pretty ideal. But trust me when I tell you being .5" out of spec is nothing.

Again a dually cummins truck comes stock with 235/80/17 Which are 9.60" section width on a 6" rim.